Commit | Line | Data |
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c906108c SS |
1 | /* Target-dependent code for the Matsushita MN10300 for GDB, the GNU debugger. |
2 | Copyright 1996, 1997, 1998 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "obstack.h" | |
25 | #include "target.h" | |
26 | #include "value.h" | |
27 | #include "bfd.h" | |
28 | #include "gdb_string.h" | |
29 | #include "gdbcore.h" | |
30 | #include "symfile.h" | |
31 | ||
c2c6d25f | 32 | extern void _initialize_mn10300_tdep (void); |
c5aa993b JM |
33 | static CORE_ADDR mn10300_analyze_prologue PARAMS ((struct frame_info * fi, |
34 | CORE_ADDR pc)); | |
c906108c SS |
35 | |
36 | /* Additional info used by the frame */ | |
37 | ||
38 | struct frame_extra_info | |
c5aa993b JM |
39 | { |
40 | int status; | |
41 | int stack_size; | |
42 | }; | |
c906108c | 43 | |
0f71a2f6 | 44 | |
c5aa993b JM |
45 | static char *mn10300_generic_register_names[] = |
46 | {"d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
47 | "sp", "pc", "mdr", "psw", "lir", "lar", "", "", | |
48 | "", "", "", "", "", "", "", "", | |
49 | "", "", "", "", "", "", "", "fp"}; | |
0f71a2f6 JM |
50 | |
51 | static char **mn10300_register_names = mn10300_generic_register_names; | |
c2d11a7d JM |
52 | static char *am33_register_names[] = |
53 | { | |
54 | "d0", "d1", "d2", "d3", "a0", "a1", "a2", "a3", | |
55 | "sp", "pc", "mdr", "psw", "lir", "lar", "", | |
56 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", | |
57 | "ssp", "msp", "usp", "mcrh", "mcrl", "mcvf", "", "", ""}; | |
58 | static int am33_mode; | |
0f71a2f6 JM |
59 | |
60 | char * | |
61 | mn10300_register_name (i) | |
62 | int i; | |
63 | { | |
64 | return mn10300_register_names[i]; | |
65 | } | |
66 | ||
67 | CORE_ADDR | |
68 | mn10300_saved_pc_after_call (fi) | |
69 | struct frame_info *fi; | |
70 | { | |
71 | return read_memory_integer (read_register (SP_REGNUM), 4); | |
72 | } | |
73 | ||
74 | void | |
75 | mn10300_extract_return_value (type, regbuf, valbuf) | |
76 | struct type *type; | |
77 | char *regbuf; | |
78 | char *valbuf; | |
79 | { | |
80 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
81 | memcpy (valbuf, regbuf + REGISTER_BYTE (4), TYPE_LENGTH (type)); | |
82 | else | |
83 | memcpy (valbuf, regbuf + REGISTER_BYTE (0), TYPE_LENGTH (type)); | |
84 | } | |
85 | ||
86 | CORE_ADDR | |
87 | mn10300_extract_struct_value_address (regbuf) | |
88 | char *regbuf; | |
89 | { | |
90 | return extract_address (regbuf + REGISTER_BYTE (4), | |
91 | REGISTER_RAW_SIZE (4)); | |
92 | } | |
93 | ||
94 | void | |
95 | mn10300_store_return_value (type, valbuf) | |
96 | struct type *type; | |
97 | char *valbuf; | |
98 | { | |
99 | if (TYPE_CODE (type) == TYPE_CODE_PTR) | |
100 | write_register_bytes (REGISTER_BYTE (4), valbuf, TYPE_LENGTH (type)); | |
101 | else | |
102 | write_register_bytes (REGISTER_BYTE (0), valbuf, TYPE_LENGTH (type)); | |
103 | } | |
104 | ||
c906108c SS |
105 | static struct frame_info *analyze_dummy_frame PARAMS ((CORE_ADDR, CORE_ADDR)); |
106 | static struct frame_info * | |
107 | analyze_dummy_frame (pc, frame) | |
108 | CORE_ADDR pc; | |
109 | CORE_ADDR frame; | |
110 | { | |
111 | static struct frame_info *dummy = NULL; | |
112 | if (dummy == NULL) | |
113 | { | |
114 | dummy = xmalloc (sizeof (struct frame_info)); | |
115 | dummy->saved_regs = xmalloc (SIZEOF_FRAME_SAVED_REGS); | |
116 | dummy->extra_info = xmalloc (sizeof (struct frame_extra_info)); | |
117 | } | |
118 | dummy->next = NULL; | |
119 | dummy->prev = NULL; | |
120 | dummy->pc = pc; | |
121 | dummy->frame = frame; | |
122 | dummy->extra_info->status = 0; | |
123 | dummy->extra_info->stack_size = 0; | |
124 | memset (dummy->saved_regs, '\000', SIZEOF_FRAME_SAVED_REGS); | |
125 | mn10300_analyze_prologue (dummy, 0); | |
126 | return dummy; | |
127 | } | |
128 | ||
129 | /* Values for frame_info.status */ | |
130 | ||
131 | #define MY_FRAME_IN_SP 0x1 | |
132 | #define MY_FRAME_IN_FP 0x2 | |
133 | #define NO_MORE_FRAMES 0x4 | |
134 | ||
135 | ||
136 | /* Should call_function allocate stack space for a struct return? */ | |
137 | int | |
138 | mn10300_use_struct_convention (gcc_p, type) | |
139 | int gcc_p; | |
140 | struct type *type; | |
141 | { | |
142 | return (TYPE_NFIELDS (type) > 1 || TYPE_LENGTH (type) > 8); | |
143 | } | |
144 | ||
145 | /* The breakpoint instruction must be the same size as the smallest | |
146 | instruction in the instruction set. | |
147 | ||
148 | The Matsushita mn10x00 processors have single byte instructions | |
149 | so we need a single byte breakpoint. Matsushita hasn't defined | |
150 | one, so we defined it ourselves. */ | |
151 | ||
152 | unsigned char * | |
153 | mn10300_breakpoint_from_pc (bp_addr, bp_size) | |
154 | CORE_ADDR *bp_addr; | |
155 | int *bp_size; | |
156 | { | |
c5aa993b JM |
157 | static char breakpoint[] = |
158 | {0xff}; | |
c906108c SS |
159 | *bp_size = 1; |
160 | return breakpoint; | |
161 | } | |
162 | ||
163 | ||
164 | /* Fix fi->frame if it's bogus at this point. This is a helper | |
165 | function for mn10300_analyze_prologue. */ | |
166 | ||
167 | static void | |
168 | fix_frame_pointer (fi, stack_size) | |
c5aa993b JM |
169 | struct frame_info *fi; |
170 | int stack_size; | |
c906108c SS |
171 | { |
172 | if (fi && fi->next == NULL) | |
173 | { | |
174 | if (fi->extra_info->status & MY_FRAME_IN_SP) | |
175 | fi->frame = read_sp () - stack_size; | |
176 | else if (fi->extra_info->status & MY_FRAME_IN_FP) | |
177 | fi->frame = read_register (A3_REGNUM); | |
178 | } | |
179 | } | |
180 | ||
181 | ||
182 | /* Set offsets of registers saved by movm instruction. | |
183 | This is a helper function for mn10300_analyze_prologue. */ | |
184 | ||
185 | static void | |
186 | set_movm_offsets (fi, movm_args) | |
c5aa993b JM |
187 | struct frame_info *fi; |
188 | int movm_args; | |
c906108c SS |
189 | { |
190 | int offset = 0; | |
191 | ||
192 | if (fi == NULL || movm_args == 0) | |
193 | return; | |
194 | ||
195 | if (movm_args & 0x10) | |
196 | { | |
197 | fi->saved_regs[A3_REGNUM] = fi->frame + offset; | |
198 | offset += 4; | |
199 | } | |
200 | if (movm_args & 0x20) | |
201 | { | |
202 | fi->saved_regs[A2_REGNUM] = fi->frame + offset; | |
203 | offset += 4; | |
204 | } | |
205 | if (movm_args & 0x40) | |
206 | { | |
207 | fi->saved_regs[D3_REGNUM] = fi->frame + offset; | |
208 | offset += 4; | |
209 | } | |
210 | if (movm_args & 0x80) | |
211 | { | |
212 | fi->saved_regs[D2_REGNUM] = fi->frame + offset; | |
213 | offset += 4; | |
214 | } | |
c2d11a7d JM |
215 | if (am33_mode && movm_args & 0x02) |
216 | { | |
217 | fi->saved_regs[E0_REGNUM + 5] = fi->frame + offset; | |
218 | fi->saved_regs[E0_REGNUM + 4] = fi->frame + offset + 4; | |
219 | fi->saved_regs[E0_REGNUM + 3] = fi->frame + offset + 8; | |
220 | fi->saved_regs[E0_REGNUM + 2] = fi->frame + offset + 12; | |
221 | } | |
c906108c SS |
222 | } |
223 | ||
224 | ||
225 | /* The main purpose of this file is dealing with prologues to extract | |
226 | information about stack frames and saved registers. | |
227 | ||
228 | For reference here's how prologues look on the mn10300: | |
229 | ||
c5aa993b JM |
230 | With frame pointer: |
231 | movm [d2,d3,a2,a3],sp | |
232 | mov sp,a3 | |
233 | add <size>,sp | |
c906108c | 234 | |
c5aa993b JM |
235 | Without frame pointer: |
236 | movm [d2,d3,a2,a3],sp (if needed) | |
237 | add <size>,sp | |
c906108c SS |
238 | |
239 | One day we might keep the stack pointer constant, that won't | |
240 | change the code for prologues, but it will make the frame | |
241 | pointerless case much more common. */ | |
c5aa993b | 242 | |
c906108c SS |
243 | /* Analyze the prologue to determine where registers are saved, |
244 | the end of the prologue, etc etc. Return the end of the prologue | |
245 | scanned. | |
246 | ||
247 | We store into FI (if non-null) several tidbits of information: | |
248 | ||
c5aa993b JM |
249 | * stack_size -- size of this stack frame. Note that if we stop in |
250 | certain parts of the prologue/epilogue we may claim the size of the | |
251 | current frame is zero. This happens when the current frame has | |
252 | not been allocated yet or has already been deallocated. | |
c906108c | 253 | |
c5aa993b | 254 | * fsr -- Addresses of registers saved in the stack by this frame. |
c906108c | 255 | |
c5aa993b JM |
256 | * status -- A (relatively) generic status indicator. It's a bitmask |
257 | with the following bits: | |
c906108c | 258 | |
c5aa993b JM |
259 | MY_FRAME_IN_SP: The base of the current frame is actually in |
260 | the stack pointer. This can happen for frame pointerless | |
261 | functions, or cases where we're stopped in the prologue/epilogue | |
262 | itself. For these cases mn10300_analyze_prologue will need up | |
263 | update fi->frame before returning or analyzing the register | |
264 | save instructions. | |
c906108c | 265 | |
c5aa993b JM |
266 | MY_FRAME_IN_FP: The base of the current frame is in the |
267 | frame pointer register ($a2). | |
c906108c | 268 | |
c5aa993b JM |
269 | NO_MORE_FRAMES: Set this if the current frame is "start" or |
270 | if the first instruction looks like mov <imm>,sp. This tells | |
271 | frame chain to not bother trying to unwind past this frame. */ | |
c906108c SS |
272 | |
273 | static CORE_ADDR | |
274 | mn10300_analyze_prologue (fi, pc) | |
c5aa993b JM |
275 | struct frame_info *fi; |
276 | CORE_ADDR pc; | |
c906108c SS |
277 | { |
278 | CORE_ADDR func_addr, func_end, addr, stop; | |
279 | CORE_ADDR stack_size; | |
280 | int imm_size; | |
281 | unsigned char buf[4]; | |
282 | int status, movm_args = 0; | |
283 | char *name; | |
284 | ||
285 | /* Use the PC in the frame if it's provided to look up the | |
286 | start of this function. */ | |
287 | pc = (fi ? fi->pc : pc); | |
288 | ||
289 | /* Find the start of this function. */ | |
290 | status = find_pc_partial_function (pc, &name, &func_addr, &func_end); | |
291 | ||
292 | /* Do nothing if we couldn't find the start of this function or if we're | |
293 | stopped at the first instruction in the prologue. */ | |
294 | if (status == 0) | |
43ff13b4 JM |
295 | { |
296 | return pc; | |
297 | } | |
c906108c SS |
298 | |
299 | /* If we're in start, then give up. */ | |
300 | if (strcmp (name, "start") == 0) | |
301 | { | |
302 | if (fi != NULL) | |
303 | fi->extra_info->status = NO_MORE_FRAMES; | |
304 | return pc; | |
305 | } | |
306 | ||
307 | /* At the start of a function our frame is in the stack pointer. */ | |
308 | if (fi) | |
309 | fi->extra_info->status = MY_FRAME_IN_SP; | |
310 | ||
311 | /* Get the next two bytes into buf, we need two because rets is a two | |
312 | byte insn and the first isn't enough to uniquely identify it. */ | |
313 | status = read_memory_nobpt (pc, buf, 2); | |
314 | if (status != 0) | |
315 | return pc; | |
316 | ||
317 | /* If we're physically on an "rets" instruction, then our frame has | |
318 | already been deallocated. Note this can also be true for retf | |
319 | and ret if they specify a size of zero. | |
320 | ||
321 | In this case fi->frame is bogus, we need to fix it. */ | |
322 | if (fi && buf[0] == 0xf0 && buf[1] == 0xfc) | |
323 | { | |
324 | if (fi->next == NULL) | |
325 | fi->frame = read_sp (); | |
326 | return fi->pc; | |
327 | } | |
328 | ||
329 | /* Similarly if we're stopped on the first insn of a prologue as our | |
330 | frame hasn't been allocated yet. */ | |
331 | if (fi && fi->pc == func_addr) | |
332 | { | |
333 | if (fi->next == NULL) | |
334 | fi->frame = read_sp (); | |
335 | return fi->pc; | |
336 | } | |
337 | ||
338 | /* Figure out where to stop scanning. */ | |
339 | stop = fi ? fi->pc : func_end; | |
340 | ||
341 | /* Don't walk off the end of the function. */ | |
342 | stop = stop > func_end ? func_end : stop; | |
343 | ||
344 | /* Start scanning on the first instruction of this function. */ | |
345 | addr = func_addr; | |
346 | ||
347 | /* Suck in two bytes. */ | |
348 | status = read_memory_nobpt (addr, buf, 2); | |
349 | if (status != 0) | |
350 | { | |
351 | fix_frame_pointer (fi, 0); | |
352 | return addr; | |
353 | } | |
354 | ||
355 | /* First see if this insn sets the stack pointer; if so, it's something | |
356 | we won't understand, so quit now. */ | |
357 | if (buf[0] == 0xf2 && (buf[1] & 0xf3) == 0xf0) | |
358 | { | |
359 | if (fi) | |
360 | fi->extra_info->status = NO_MORE_FRAMES; | |
361 | return addr; | |
362 | } | |
363 | ||
364 | /* Now look for movm [regs],sp, which saves the callee saved registers. | |
365 | ||
366 | At this time we don't know if fi->frame is valid, so we only note | |
367 | that we encountered a movm instruction. Later, we'll set the entries | |
368 | in fsr.regs as needed. */ | |
369 | if (buf[0] == 0xcf) | |
370 | { | |
371 | /* Extract the register list for the movm instruction. */ | |
372 | status = read_memory_nobpt (addr + 1, buf, 1); | |
373 | movm_args = *buf; | |
374 | ||
375 | addr += 2; | |
376 | ||
377 | /* Quit now if we're beyond the stop point. */ | |
378 | if (addr >= stop) | |
379 | { | |
380 | /* Fix fi->frame since it's bogus at this point. */ | |
381 | if (fi && fi->next == NULL) | |
382 | fi->frame = read_sp (); | |
383 | ||
384 | /* Note if/where callee saved registers were saved. */ | |
385 | set_movm_offsets (fi, movm_args); | |
386 | return addr; | |
387 | } | |
388 | ||
389 | /* Get the next two bytes so the prologue scan can continue. */ | |
390 | status = read_memory_nobpt (addr, buf, 2); | |
391 | if (status != 0) | |
392 | { | |
393 | /* Fix fi->frame since it's bogus at this point. */ | |
394 | if (fi && fi->next == NULL) | |
395 | fi->frame = read_sp (); | |
396 | ||
397 | /* Note if/where callee saved registers were saved. */ | |
398 | set_movm_offsets (fi, movm_args); | |
399 | return addr; | |
400 | } | |
401 | } | |
402 | ||
403 | /* Now see if we set up a frame pointer via "mov sp,a3" */ | |
404 | if (buf[0] == 0x3f) | |
405 | { | |
406 | addr += 1; | |
407 | ||
408 | /* The frame pointer is now valid. */ | |
409 | if (fi) | |
410 | { | |
411 | fi->extra_info->status |= MY_FRAME_IN_FP; | |
412 | fi->extra_info->status &= ~MY_FRAME_IN_SP; | |
413 | } | |
414 | ||
415 | /* Quit now if we're beyond the stop point. */ | |
416 | if (addr >= stop) | |
417 | { | |
418 | /* Fix fi->frame if it's bogus at this point. */ | |
419 | fix_frame_pointer (fi, 0); | |
420 | ||
421 | /* Note if/where callee saved registers were saved. */ | |
422 | set_movm_offsets (fi, movm_args); | |
423 | return addr; | |
424 | } | |
425 | ||
426 | /* Get two more bytes so scanning can continue. */ | |
427 | status = read_memory_nobpt (addr, buf, 2); | |
428 | if (status != 0) | |
429 | { | |
430 | /* Fix fi->frame if it's bogus at this point. */ | |
431 | fix_frame_pointer (fi, 0); | |
432 | ||
433 | /* Note if/where callee saved registers were saved. */ | |
434 | set_movm_offsets (fi, movm_args); | |
435 | return addr; | |
436 | } | |
437 | } | |
c5aa993b | 438 | |
c906108c SS |
439 | /* Next we should allocate the local frame. No more prologue insns |
440 | are found after allocating the local frame. | |
c5aa993b | 441 | |
c906108c | 442 | Search for add imm8,sp (0xf8feXX) |
c5aa993b JM |
443 | or add imm16,sp (0xfafeXXXX) |
444 | or add imm32,sp (0xfcfeXXXXXXXX). | |
445 | ||
c906108c SS |
446 | If none of the above was found, then this prologue has no |
447 | additional stack. */ | |
448 | ||
449 | status = read_memory_nobpt (addr, buf, 2); | |
450 | if (status != 0) | |
451 | { | |
452 | /* Fix fi->frame if it's bogus at this point. */ | |
453 | fix_frame_pointer (fi, 0); | |
454 | ||
455 | /* Note if/where callee saved registers were saved. */ | |
456 | set_movm_offsets (fi, movm_args); | |
457 | return addr; | |
458 | } | |
459 | ||
460 | imm_size = 0; | |
461 | if (buf[0] == 0xf8 && buf[1] == 0xfe) | |
462 | imm_size = 1; | |
463 | else if (buf[0] == 0xfa && buf[1] == 0xfe) | |
464 | imm_size = 2; | |
465 | else if (buf[0] == 0xfc && buf[1] == 0xfe) | |
466 | imm_size = 4; | |
467 | ||
468 | if (imm_size != 0) | |
469 | { | |
470 | /* Suck in imm_size more bytes, they'll hold the size of the | |
471 | current frame. */ | |
472 | status = read_memory_nobpt (addr + 2, buf, imm_size); | |
473 | if (status != 0) | |
474 | { | |
475 | /* Fix fi->frame if it's bogus at this point. */ | |
476 | fix_frame_pointer (fi, 0); | |
477 | ||
478 | /* Note if/where callee saved registers were saved. */ | |
479 | set_movm_offsets (fi, movm_args); | |
480 | return addr; | |
481 | } | |
482 | ||
483 | /* Note the size of the stack in the frame info structure. */ | |
484 | stack_size = extract_signed_integer (buf, imm_size); | |
485 | if (fi) | |
486 | fi->extra_info->stack_size = stack_size; | |
487 | ||
488 | /* We just consumed 2 + imm_size bytes. */ | |
489 | addr += 2 + imm_size; | |
490 | ||
491 | /* No more prologue insns follow, so begin preparation to return. */ | |
492 | /* Fix fi->frame if it's bogus at this point. */ | |
493 | fix_frame_pointer (fi, stack_size); | |
494 | ||
495 | /* Note if/where callee saved registers were saved. */ | |
496 | set_movm_offsets (fi, movm_args); | |
497 | return addr; | |
498 | } | |
499 | ||
500 | /* We never found an insn which allocates local stack space, regardless | |
501 | this is the end of the prologue. */ | |
502 | /* Fix fi->frame if it's bogus at this point. */ | |
503 | fix_frame_pointer (fi, 0); | |
504 | ||
505 | /* Note if/where callee saved registers were saved. */ | |
506 | set_movm_offsets (fi, movm_args); | |
507 | return addr; | |
508 | } | |
c5aa993b | 509 | |
c906108c SS |
510 | /* Function: frame_chain |
511 | Figure out and return the caller's frame pointer given current | |
512 | frame_info struct. | |
513 | ||
514 | We don't handle dummy frames yet but we would probably just return the | |
515 | stack pointer that was in use at the time the function call was made? */ | |
516 | ||
517 | CORE_ADDR | |
518 | mn10300_frame_chain (fi) | |
519 | struct frame_info *fi; | |
520 | { | |
521 | struct frame_info *dummy; | |
522 | /* Walk through the prologue to determine the stack size, | |
523 | location of saved registers, end of the prologue, etc. */ | |
524 | if (fi->extra_info->status == 0) | |
c5aa993b | 525 | mn10300_analyze_prologue (fi, (CORE_ADDR) 0); |
c906108c SS |
526 | |
527 | /* Quit now if mn10300_analyze_prologue set NO_MORE_FRAMES. */ | |
528 | if (fi->extra_info->status & NO_MORE_FRAMES) | |
529 | return 0; | |
530 | ||
531 | /* Now that we've analyzed our prologue, determine the frame | |
532 | pointer for our caller. | |
533 | ||
c5aa993b JM |
534 | If our caller has a frame pointer, then we need to |
535 | find the entry value of $a3 to our function. | |
536 | ||
537 | If fsr.regs[A3_REGNUM] is nonzero, then it's at the memory | |
538 | location pointed to by fsr.regs[A3_REGNUM]. | |
c906108c | 539 | |
c5aa993b | 540 | Else it's still in $a3. |
c906108c | 541 | |
c5aa993b JM |
542 | If our caller does not have a frame pointer, then his |
543 | frame base is fi->frame + -caller's stack size. */ | |
c906108c | 544 | |
c906108c SS |
545 | /* The easiest way to get that info is to analyze our caller's frame. |
546 | So we set up a dummy frame and call mn10300_analyze_prologue to | |
547 | find stuff for us. */ | |
548 | dummy = analyze_dummy_frame (FRAME_SAVED_PC (fi), fi->frame); | |
549 | ||
550 | if (dummy->extra_info->status & MY_FRAME_IN_FP) | |
551 | { | |
552 | /* Our caller has a frame pointer. So find the frame in $a3 or | |
553 | in the stack. */ | |
554 | if (fi->saved_regs[A3_REGNUM]) | |
555 | return (read_memory_integer (fi->saved_regs[A3_REGNUM], REGISTER_SIZE)); | |
556 | else | |
557 | return read_register (A3_REGNUM); | |
558 | } | |
559 | else | |
560 | { | |
561 | int adjust = 0; | |
562 | ||
563 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
564 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
565 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
566 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
c2d11a7d JM |
567 | if (am33_mode) |
568 | { | |
569 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
570 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
571 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
572 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
573 | } | |
c906108c SS |
574 | |
575 | /* Our caller does not have a frame pointer. So his frame starts | |
c5aa993b JM |
576 | at the base of our frame (fi->frame) + register save space |
577 | + <his size>. */ | |
c906108c SS |
578 | return fi->frame + adjust + -dummy->extra_info->stack_size; |
579 | } | |
580 | } | |
581 | ||
582 | /* Function: skip_prologue | |
583 | Return the address of the first inst past the prologue of the function. */ | |
584 | ||
585 | CORE_ADDR | |
586 | mn10300_skip_prologue (pc) | |
587 | CORE_ADDR pc; | |
588 | { | |
589 | /* We used to check the debug symbols, but that can lose if | |
590 | we have a null prologue. */ | |
591 | return mn10300_analyze_prologue (NULL, pc); | |
592 | } | |
593 | ||
594 | ||
595 | /* Function: pop_frame | |
596 | This routine gets called when either the user uses the `return' | |
597 | command, or the call dummy breakpoint gets hit. */ | |
598 | ||
599 | void | |
600 | mn10300_pop_frame (frame) | |
601 | struct frame_info *frame; | |
602 | { | |
603 | int regnum; | |
604 | ||
c5aa993b | 605 | if (PC_IN_CALL_DUMMY (frame->pc, frame->frame, frame->frame)) |
c906108c SS |
606 | generic_pop_dummy_frame (); |
607 | else | |
608 | { | |
609 | write_register (PC_REGNUM, FRAME_SAVED_PC (frame)); | |
610 | ||
611 | /* Restore any saved registers. */ | |
612 | for (regnum = 0; regnum < NUM_REGS; regnum++) | |
613 | if (frame->saved_regs[regnum] != 0) | |
614 | { | |
615 | ULONGEST value; | |
616 | ||
617 | value = read_memory_unsigned_integer (frame->saved_regs[regnum], | |
c5aa993b | 618 | REGISTER_RAW_SIZE (regnum)); |
c906108c SS |
619 | write_register (regnum, value); |
620 | } | |
621 | ||
622 | /* Actually cut back the stack. */ | |
623 | write_register (SP_REGNUM, FRAME_FP (frame)); | |
624 | ||
625 | /* Don't we need to set the PC?!? XXX FIXME. */ | |
626 | } | |
627 | ||
628 | /* Throw away any cached frame information. */ | |
629 | flush_cached_frames (); | |
630 | } | |
631 | ||
632 | /* Function: push_arguments | |
633 | Setup arguments for a call to the target. Arguments go in | |
634 | order on the stack. */ | |
635 | ||
636 | CORE_ADDR | |
637 | mn10300_push_arguments (nargs, args, sp, struct_return, struct_addr) | |
638 | int nargs; | |
639 | value_ptr *args; | |
640 | CORE_ADDR sp; | |
641 | unsigned char struct_return; | |
642 | CORE_ADDR struct_addr; | |
643 | { | |
644 | int argnum = 0; | |
645 | int len = 0; | |
646 | int stack_offset = 0; | |
647 | int regsused = struct_return ? 1 : 0; | |
648 | ||
649 | /* This should be a nop, but align the stack just in case something | |
650 | went wrong. Stacks are four byte aligned on the mn10300. */ | |
651 | sp &= ~3; | |
652 | ||
653 | /* Now make space on the stack for the args. | |
654 | ||
655 | XXX This doesn't appear to handle pass-by-invisible reference | |
656 | arguments. */ | |
657 | for (argnum = 0; argnum < nargs; argnum++) | |
658 | { | |
659 | int arg_length = (TYPE_LENGTH (VALUE_TYPE (args[argnum])) + 3) & ~3; | |
660 | ||
661 | while (regsused < 2 && arg_length > 0) | |
662 | { | |
663 | regsused++; | |
664 | arg_length -= 4; | |
665 | } | |
666 | len += arg_length; | |
667 | } | |
668 | ||
669 | /* Allocate stack space. */ | |
670 | sp -= len; | |
671 | ||
672 | regsused = struct_return ? 1 : 0; | |
673 | /* Push all arguments onto the stack. */ | |
674 | for (argnum = 0; argnum < nargs; argnum++) | |
675 | { | |
676 | int len; | |
677 | char *val; | |
678 | ||
679 | /* XXX Check this. What about UNIONS? */ | |
680 | if (TYPE_CODE (VALUE_TYPE (*args)) == TYPE_CODE_STRUCT | |
681 | && TYPE_LENGTH (VALUE_TYPE (*args)) > 8) | |
682 | { | |
683 | /* XXX Wrong, we want a pointer to this argument. */ | |
c5aa993b JM |
684 | len = TYPE_LENGTH (VALUE_TYPE (*args)); |
685 | val = (char *) VALUE_CONTENTS (*args); | |
c906108c SS |
686 | } |
687 | else | |
688 | { | |
689 | len = TYPE_LENGTH (VALUE_TYPE (*args)); | |
c5aa993b | 690 | val = (char *) VALUE_CONTENTS (*args); |
c906108c SS |
691 | } |
692 | ||
693 | while (regsused < 2 && len > 0) | |
694 | { | |
695 | write_register (regsused, extract_unsigned_integer (val, 4)); | |
696 | val += 4; | |
697 | len -= 4; | |
698 | regsused++; | |
699 | } | |
700 | ||
701 | while (len > 0) | |
702 | { | |
703 | write_memory (sp + stack_offset, val, 4); | |
704 | len -= 4; | |
705 | val += 4; | |
706 | stack_offset += 4; | |
707 | } | |
708 | ||
709 | args++; | |
710 | } | |
711 | ||
712 | /* Make space for the flushback area. */ | |
713 | sp -= 8; | |
714 | return sp; | |
715 | } | |
716 | ||
717 | /* Function: push_return_address (pc) | |
718 | Set up the return address for the inferior function call. | |
719 | Needed for targets where we don't actually execute a JSR/BSR instruction */ | |
c5aa993b | 720 | |
c906108c SS |
721 | CORE_ADDR |
722 | mn10300_push_return_address (pc, sp) | |
723 | CORE_ADDR pc; | |
724 | CORE_ADDR sp; | |
725 | { | |
726 | unsigned char buf[4]; | |
727 | ||
728 | store_unsigned_integer (buf, 4, CALL_DUMMY_ADDRESS ()); | |
729 | write_memory (sp - 4, buf, 4); | |
730 | return sp - 4; | |
731 | } | |
732 | ||
733 | /* Function: store_struct_return (addr,sp) | |
734 | Store the structure value return address for an inferior function | |
735 | call. */ | |
c5aa993b | 736 | |
c906108c SS |
737 | CORE_ADDR |
738 | mn10300_store_struct_return (addr, sp) | |
739 | CORE_ADDR addr; | |
740 | CORE_ADDR sp; | |
741 | { | |
742 | /* The structure return address is passed as the first argument. */ | |
743 | write_register (0, addr); | |
744 | return sp; | |
745 | } | |
c5aa993b | 746 | |
c906108c SS |
747 | /* Function: frame_saved_pc |
748 | Find the caller of this frame. We do this by seeing if RP_REGNUM | |
749 | is saved in the stack anywhere, otherwise we get it from the | |
750 | registers. If the inner frame is a dummy frame, return its PC | |
751 | instead of RP, because that's where "caller" of the dummy-frame | |
752 | will be found. */ | |
753 | ||
754 | CORE_ADDR | |
755 | mn10300_frame_saved_pc (fi) | |
756 | struct frame_info *fi; | |
757 | { | |
758 | int adjust = 0; | |
759 | ||
760 | adjust += (fi->saved_regs[D2_REGNUM] ? 4 : 0); | |
761 | adjust += (fi->saved_regs[D3_REGNUM] ? 4 : 0); | |
762 | adjust += (fi->saved_regs[A2_REGNUM] ? 4 : 0); | |
763 | adjust += (fi->saved_regs[A3_REGNUM] ? 4 : 0); | |
c2d11a7d JM |
764 | if (am33_mode) |
765 | { | |
766 | adjust += (fi->saved_regs[E0_REGNUM + 5] ? 4 : 0); | |
767 | adjust += (fi->saved_regs[E0_REGNUM + 4] ? 4 : 0); | |
768 | adjust += (fi->saved_regs[E0_REGNUM + 3] ? 4 : 0); | |
769 | adjust += (fi->saved_regs[E0_REGNUM + 2] ? 4 : 0); | |
770 | } | |
c906108c SS |
771 | |
772 | return (read_memory_integer (fi->frame + adjust, REGISTER_SIZE)); | |
773 | } | |
774 | ||
c906108c SS |
775 | /* Function: mn10300_init_extra_frame_info |
776 | Setup the frame's frame pointer, pc, and frame addresses for saved | |
777 | registers. Most of the work is done in mn10300_analyze_prologue(). | |
778 | ||
779 | Note that when we are called for the last frame (currently active frame), | |
780 | that fi->pc and fi->frame will already be setup. However, fi->frame will | |
781 | be valid only if this routine uses FP. For previous frames, fi-frame will | |
782 | always be correct. mn10300_analyze_prologue will fix fi->frame if | |
783 | it's not valid. | |
784 | ||
785 | We can be called with the PC in the call dummy under two circumstances. | |
786 | First, during normal backtracing, second, while figuring out the frame | |
787 | pointer just prior to calling the target function (see run_stack_dummy). */ | |
788 | ||
789 | void | |
790 | mn10300_init_extra_frame_info (fi) | |
791 | struct frame_info *fi; | |
792 | { | |
793 | if (fi->next) | |
794 | fi->pc = FRAME_SAVED_PC (fi->next); | |
795 | ||
796 | frame_saved_regs_zalloc (fi); | |
797 | fi->extra_info = (struct frame_extra_info *) | |
798 | frame_obstack_alloc (sizeof (struct frame_extra_info)); | |
799 | ||
800 | fi->extra_info->status = 0; | |
801 | fi->extra_info->stack_size = 0; | |
802 | ||
803 | mn10300_analyze_prologue (fi, 0); | |
804 | } | |
805 | ||
806 | /* Function: mn10300_virtual_frame_pointer | |
807 | Return the register that the function uses for a frame pointer, | |
808 | plus any necessary offset to be applied to the register before | |
809 | any frame pointer offsets. */ | |
810 | ||
811 | void | |
812 | mn10300_virtual_frame_pointer (pc, reg, offset) | |
813 | CORE_ADDR pc; | |
814 | long *reg; | |
815 | long *offset; | |
816 | { | |
817 | struct frame_info *dummy = analyze_dummy_frame (pc, 0); | |
818 | /* Set up a dummy frame_info, Analyze the prolog and fill in the | |
819 | extra info. */ | |
820 | /* Results will tell us which type of frame it uses. */ | |
821 | if (dummy->extra_info->status & MY_FRAME_IN_SP) | |
822 | { | |
c5aa993b | 823 | *reg = SP_REGNUM; |
c906108c SS |
824 | *offset = -(dummy->extra_info->stack_size); |
825 | } | |
826 | else | |
827 | { | |
c5aa993b | 828 | *reg = A3_REGNUM; |
c906108c SS |
829 | *offset = 0; |
830 | } | |
831 | } | |
c5aa993b | 832 | |
c906108c SS |
833 | /* This can be made more generic later. */ |
834 | static void | |
835 | set_machine_hook (filename) | |
836 | char *filename; | |
837 | { | |
838 | int i; | |
839 | ||
840 | if (bfd_get_mach (exec_bfd) == bfd_mach_mn10300 | |
841 | || bfd_get_mach (exec_bfd) == 0) | |
842 | { | |
843 | mn10300_register_names = mn10300_generic_register_names; | |
844 | } | |
845 | ||
c2d11a7d JM |
846 | am33_mode = 0; |
847 | if (bfd_get_mach (exec_bfd) == bfd_mach_am33) | |
848 | { | |
849 | ||
850 | mn10300_register_names = am33_register_names; | |
851 | am33_mode = 1; | |
852 | } | |
c906108c SS |
853 | } |
854 | ||
855 | void | |
856 | _initialize_mn10300_tdep () | |
857 | { | |
858 | /* printf("_initialize_mn10300_tdep\n"); */ | |
859 | ||
860 | tm_print_insn = print_insn_mn10300; | |
861 | ||
862 | specify_exec_file_hook (set_machine_hook); | |
863 | } |